[R] Bumps chart in R

[ONKELINX, Thierry]

Dear Andreas and Mike,

You need to use scale_colour_manual() if you want to set the colours yourself. Ggplot2 interpretes the "col" variable in the dataset as an ordinairy factor. 

library(ggplot2)
df0 <- data.frame(text = letters[1:21], tal1 = c(rnorm (20,5,2), 5), tal2 = c(rnorm (20,6,3), 5))
df0$dif <- df0$tal2 - df0$tal1
df <- melt(data = df0, id.vars = c('text', 'dif'), variable_name = 'tal')
df$Change <- factor(ifelse(df$dif>0,'Up',ifelse(df$dif<0,'Down','Stable')), levels = c("Up", "Stable", "Down"))
df$size <- abs(df$dif)
ggplot(df, aes(x = tal, y = value, label = text, group = text, size = size, col = Change)) + geom_line() + geom_text(data = subset(df, tal=="tal1"), size=3, hjust=2, vjust=0) + scale_x_discrete("Change from time to time") + scale_y_continuous("Points") + theme_bw()+ opts(legend.position="none")+ opts(title="As time went by\n") +opts(plot.title=theme_text(vjust=0,size=20)) + scale_colour_manual(values = c("red", "black", "blue"))

HTH,

Thierry

----------------------------------------------------------------------------
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

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~ Sir Ronald Aylmer Fisher

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~ Roger Brinner

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-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Namens Andreas Christoffersen
Verzonden: donderdag 7 mei 2009 12:22
Aan: Mike Lawrence; r-help at r-project.org; ggplot2 at googlegroups.com
Onderwerp: Re: [R] Bumps chart in R

On Thu, May 7, 2009 at 2:15 AM, Mike Lawrence <Mike.Lawrence at dal.ca> wrote:
> (cross posting to the ggplot2 group for posterity)
>
> Here's how I'd approach it:
>
> library(ggplot2)
> text = letters[1:20]
> tal1 = rnorm (20,5,2)
> tal2 = rnorm (20,6,3)
> dif = tal2-tal1
> df0 = data.frame(text,tal1,tal2)
> df = melt(
>        data = df0
>        , id.vars = 'text'
>        , variable_name = 'tal'
> )
> df$dif = dif
> df$col = ifelse(dif>0,'red',ifelse(dif<0,'blue','black'))
> df$size = abs(dif)
>
> # draw the plot
>
> Unfortunately it's not perfect:
> (1) col isn't being interpreted literally, so instead of truly red & blue.
> (2) the lines ends are square whereas usually they're rounded.
> (3) attempting to remove the legend via opts(legend.position="none")
> seems to fail.
>

Thank you

with your melted data I was able to come very close to what I want.
legen.posistion="none" works for me... Annonying that colours don't
work like expected... It seams to be a frequent concern.

My code:
qplot(tal,value,data=df,group=text,geom="line",size=size,colour=col,xlab="Change
from time to time", ylab = "Points")+
geom_text(aes(label=text),subset(df,tal=="tal1"),size=3,hjust=2,vjust=0)+
theme_bw()+ opts(legend.position="none")+ opts(title="As time went
by") +opts(plot.title=theme_text(vjust=0,size=20))

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